2001 AUDI A4 horn

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Steering angle sender G85
The determination of steering angle is per-
formed via optical elements in the steering
column electronics J527 and is supplied to
the drive CAN BUS.
The current steering angle position is thus
made available to the ESP control unit.
The steering column switch module
must always be coded.
For further information on the optical
steering angle sensor, please refer to
SSP 204.
Self-diagnosis
Communication between the diagnostic
tester and the steering column electronics
J527 is effected by means of the convenience
data bus via the central convenience electron-
ics J393, as no separate K wire is connected
to the steering column electronics.. (see
graphic 254 018 on Page 57)
The steering column electronics module with
operating unit for "tiptronic", multi-functions,
horn etc., is incorporated in the self-diagnosis.
Address word 16
After the addressing, the tester answers with
the text "steering column electronics".

Wiper
switch E
Steering angle
sensor G85
Steering column electronics
module J453 with operating
unit E221
Ignition lock registration
The signals from the terminals:
– P parking light
– 86s ignition key contact
– 75 Load-reduction relay
– 15 ignition ON
– 50 starter
are transmitted to the steering column elec-
tronics J527 via conventional wiring. The
switch positions of the ignition lock are pre-
pared by the electronics, supplied to the con-
venience CAN bus and then transmitted via
the gateway to the drive and infotainment
CAN bus systems.
Coil spring
RT

SSP254_014

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46
Auxiliary signals
1 CAN screen drive
2 Emergency vehicle distress radio
3 Emergency vehicle radio
4 Cruise control system on/off
5 CAN low convenience
6 CAN high convenience
7 CAN low drive
8 CAN high drive
9 Ignition lock terminal 75
10 Ignition lock S contact
11 Ignition lock terminal 15
12 Ignition lock terminal 50
13 Ignition lock terminal P
X
Y Connection within the functional
diagram
Z
Electrical system
Functional diagram
Steering column switch
module
(maximum equipment)
Components
E Windscreen wiper switch
E2 Turn signal switch
E45 CCS switch
E221 Operating unit in steering wheel
G85 Steering angle sender
H Horn actuation
J234 Airbag control unit
J453 Control unit for multi-function
steering wheel
J527 Control unit for steering column
electronics
S Fuse
Z36 Heated steering wheel
Colour coding
= Input signal
= Output signal
= Positive power supply
= Earth
= CAN-BUS
{

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The control unit for vehicle electrical system
J519 is the newly developed electronic central
electrics and comprises a comprehensive
self-diagnosis, which can be selected directly
with address word 09.
The control unit for vehicle electrical system
receives the input signals from the conven-
ience CAN BUS via the steering column
switch module or the rotary light control.
Pb1J0 915 105 A 1J0 915 105 A
C C
The power connections for the individual con-
sumers are driven via semi-conductor ele-
ments, e.g. transistors.
A separate supply is not required, as this is
provided by the internal electronics in the
event of a fault.

J4
Dual tone-
horn H2/H4 Control unit for
speech entry J507
Power supply
Hazard warning lights switch E3
Steering col-
umn electron-
ics J527 Rotary light control E1
Wiper system
Lighting system
Dash panel insert J285Control unit for trailer
recognition J345 Control unit for
vehicle electri-
cal system J519
Relay for
X contact J18

Electrical system
Control unit for vehicle
electrical system J519
SSP254_068

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49
There are three control unit versions:
– "lowline" for the standard version
– "lowline" for vehicles with headlight
washer system
– "highline" for vehicles with driver informa-
tion system
The following functions are available with the
"lowline" version:
– Wash/wipe control and interval
– Hazard warning and turn signal control
– Actuation of horn and load-reduction relay
– Parking light left/right
– Side light left/right
– Main beam left/right and headlight flasher
– Number plate lightThe "highline" version implements the driver
information system function and also
performs the following control functions:
– Driving light and dipped beam left/right,
– Fog lights and rear lights,
– Reversing lights,
– Brake lights
with separate outputs to each of the individ-
ual consumers.
Light control
In the highline version, light control is trans-
mitted from the steering column switch
module or directly from the rotary light
control, via the convenience data bus, to the
vehicle electrical system control unit.
Parking lights
Main beam
Headlight flasher Side lights
Dipped beam
*

Fog lights
*

Rear fog lights
*

*

In the "lowline" version, the components marked with
an asterisk are connected via conventional wiring and
fuses, directly to the lighting units.
Control unit for
vehicle electrical
system J519

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Auxiliary signals
1 CAN high convenience
2 CAN low convenience
3 Terminal 75
4 not fitted with trailer coupling
5 only with trailer coupling
6 Automatic gearbox "multitronic"
7 Manual gearbox
A
U
X
Y
Z
Electrical system
"lowline" version
Components
E1 Light switch
E3 Hazard warning light switch
F Brake light switch
F4 Reversing light switch
F216 Contact switch for switchable
rear fog lights
H2 Treble horn
H7 Bass horn
J4 Relay for dual tone horn
J59 Load-reduction relay for x contact
J345 Control unit for trailer recognition
J446 Control unit for parking aid
J519 Control unit for vehicle electrical
system
L22 Bulb for fog light, left
L23 Bulb for fog light, right
L46 Bulb for rear fog light, left
L47 Bulb for rear fog light, right
M1 Bulb for side light, left
M2 Bulb for rear light, right
M3 Bulb for side light, right
M4 Bulb for rear light, left
M5 Bulb for turn signal light, front left
M6 Bulb for turn signal light, rear left
M7 Bulb for turn signal light, front right
M8 Bulb for turn signal light, rear right
M9 Bulb for brake light, left
M10 Bulb for brake light, right
M16 Bulb for reversing light, left
M17 Bulb for reversing light, right
M18 Bulb for side turn signal light, left
M19 Bulb for side turn signal light, right
M25 Bulb for high-level brake light
M29 Bulb for dipped beam headlight, left
M30 Bulb for main beam headlight, left
M31 Bulb for dipped beam headlight, right
M32 Bulb for main beam headlight, right
S Fuses
U10 Socket for trailer operation
V Windscreen wiper motor
V5 Windscreen washer pump
Colour coding
= Input signal
= Output signal
= Positive power supply
= Earth
= CAN-BUS
V11 Pump for headlight washer
conditioning system
V48 Servo motor for headlight range
control, left
V49 Servo motor for headlight range
control, right
X Number plate lights
Connection within the
functional diagram

Functional diagram
Control unit for vehicle
electrical system J519
{

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Auxiliary signals
1 CAN high convenience
2 CAN low convenience
3 Terminal 75
4 Terminal 31
U Connection within the functional
diagram V11 Pump for headlight washer
conditioning system
V48 Servo motor for headlight range
control, left
V49 Servo motor for headlight range
control, right
X Number plate light
"highline" version
Components
E1 Light switch
E3 Hazard warning light switch
F Brake light switch
F216 Contact switch for switchable
rear fog lights
H2 Treble horn
H7 Bass horn
J4 Relay for dual tone horn
J59 Load-reduction relay for x contact
J345 Control unit for trailer recognition
J446 Control unit for parking aid
J519 Control unit for vehicle electrical
system
L22 Bulb for fog light, left
L23 Bulb for fog light, right
L46 Bulb for rear fog light, left
L47 Bulb for rear fog light, right
M1 Bulb for side light, left
M2 Bulb for rear light, right
M3 Bulb for side light, right
M4 Bulb for rear light, left
M5 Bulb for turn signal light, front left
M6 Bulb for turn signal light, rear left
M7 Bulb for turn signal light, front right
M8 Bulb for turn signal light, rear right
M9 Bulb for brake light, left
M10 Bulb for brake light, right
M16 Bulb for reversing light, left
M17 Bulb for reversing light, right
M18 Bulb for side turn signal light, left
M19 Bulb for side turn signal light, right
M25 Bulb for high-level brake light
M29 Bulb for dipped beam headlight, left
M30 Bulb for main beam headlight, left
M31 Bulb for dipped beam headlight, right
M32 Bulb for main beam headlight, right
S Fuses
U10 Socket for trailer operation
V Windscreen wiper motor
V5 Windscreen washer pump
Electrical system
Colour coding
= Input signal
= Output signal
= Positive power supply
= Earth
= CAN-BUS
Functional diagram
Control unit for vehicle
electrical system J519

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The following information and functions
are processed in the central convenience
electronics:
Crash signal
(from airbag control unit J234)
Handbrake switch F9
Tailgate release
– Button for release, tailgate lock
cylinder F248
– 3. Remote control button
– Switch for tailgate to F206
– Switch for central locking, tail-
gate F218
Anti-theft alarm (optional)
– Contact switch for bonnet F266
– Ultrasonic sensor for anti-theft
alarm G209
Aerial for remote control,
Central locking and anti-theft
alarm in multi-communication bar
Reversing lamp M17
When mechanical window lifters
fitted in rear
– Door contact signal
– Locking signal
– Safe signal
for rear doors
Fuel filler flap
– Motor for tank cap locking V155
Tailgate
– Motor for tailgate release V139
Anti-theft alarm (optional)
– Horn for anti-theft alarm H8
(sounder)
– Turn signal lights via data bus to
vehicle electrical system con-
trol unit J519
Interior light control
– Dimming of interior lighting
– Footwell light switching
(optional)
– Luggage compartment lamp
switching
Automatic closing/opening
– Window lifters via door control
units
– Sun roof
When mechanical window lifters
fitted in rear
– Lock rear door lock motors
– Safe rear door lock motors
– Activation of rear entry lights
(optional)
– Activation of rear door warning
lights
Enabling of door control units and
sunroof
Gateway function for diagnosis
– Control unit for vehicle electrical
system J519
– Steering column switch module
J527
Sensors Actuators Central convenience electronics (CCE)

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TS

Electrical system
The Audi A4 convenience system is available
with
– Anti-theft alarm
– Ultrasonic interior monitor
– Shattered glass sensor (Avant)
– Towing protection
as optional extras.
The anti-theft alarm is only activated when
the vehicle is locked via the radio remote con-
trol and by closing the driver's door.Deactivation is performed by
– opening the vehicle via the radio remote
control or
– opening the vehicle via the driver’s door
lock cylinder and switching on the ignition
within 15 seconds. If this time period is not
observed or if the key used is not stored in
the immobiliser, the alarm is triggered.
Data exchange between the immobiliser in
the dash panel insert and the central conven-
ience electronics takes place via the conven-
ience data bus.
Anti-theft alarm with interior monitor
High and low pitched tones
- air horn (sounder) Central control unit for con-
venience system J393Ignition steering
lock D Door lock
Convenience data bus
SSP254_133